Would it be recommended to ask the same couple teachers for recommendations, or have different teachers for each school?
My Calc teacher and Gov teacher have already wrote my letters for previous applications (QuestBridge and Georgia Tech), and I am deciding on whether to ask them to build on what they already have for my MIT recommendation letter, or ask my Computer Science teacher for a new letter.
I don’t want to burden the same teachers with my letters and it was through my Computer Science teacher that a student got into MIT a few years ago. On the other hand, the deadline is looming.
At most schools, (this was the case at my son’s) students request recommendation letters during spring of Junior year or beginning of Senior year from two teachers who then give the letters to the Guidance Counseling department which keeps the letters on file and includes them with each college application.
Your two prior recommenders don’t need to “build” on their previous letters, the letters were supposed to be about you, not about Questbridge or Georgia Tech, and the next letter shouldn’t be about you as well, not MIT.
That being said, if your CS teacher is willing to write an absolutely extraordinary recommendation describing you as the most outstanding student they’ve ever come across, then by all means ask.